The top third and the bottom two thirds are two different diagrams. I find the bottom two thirds the more interesting of the two. Stand yourself at the top where it says "Centrifucal force." The 'wiggle' below the word Peng is, I think, meant to represent "An jin" or hidden power, just below that is the bridge to your opponent.
There are lot's of things here for all you push-hands players out there to think about. For instance, notice that Pivoting and Grabbing are almost out side of the picture, far beyond the opponent's center.
I believe he intended us to see Ji, Lu, and An (I can't bare to translate them) as contained in the words: Open, Close, Give, Empty Receive, Adhere, Evade, Connect, and Stick.